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• 2010, No. 12　Published:25 December 2010 Last issue    Next issue
  Columns in this issue: 论文

• 论文

  A Efficient Geographical Routing Algorithm for Multimedia Wireless Sensor Networks

  LIU Liangjiao1,LI Renfa1,LI Zhetao1,2,YUE Guangxue1,3

  2010, 32(12): 1-4. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 447 )   PDF (610KB) ( 549 )   　　

  An efficient geographical routing algorithm,called AOGR（Asymptotically Optimal Geographical Routing）,has been proposed for multimedia wireless sensor networks. The existing geographical routing protocols aim at optimizing the single packet routing performance,while the new algorithm reduces the average hops of all the packets in a session. In AOGR,the reference of the delivered packets to subsequent packets in the routing will be exploited. With the increase of the routed packets,AOGR converges to the shortest path asymptotically. The simulation results show that the proposed algorithm can mitigate inefficient detours on the routes obtained by GPSR (Greedy Perimeter Stateless Routing) in its perimeter mode and reduce the average hops.

  Monitoring and Analysis of the Stream Media Application Performance for End Users

  ZHANG Mei1,2,ZENG Bin1,LI Wenwei2,ZHANG Dafang2

  2010, 32(12): 5-7. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 436 )   PDF (557KB) ( 410 )   　　

  Most of the tools for measuring streaming media applications are designed for

  pressure test,which can not reflect the actual performance at end users. During the

  development of the streaming media,the streaming media performance monitoring is very

  important. From the perspective of end users,we propose several metrics reflecting the

  performance of the streaming media applications,and accomplish a measurement method,which is

  based on active business stimulations. A simulative experiment is designed for analyzing the

  influence on the streaming media performance caused by bandwidth,frame rate,packet loss and

  delay. According to the experimental data,our work can accomplish the dynamic control of

  quality and provide a basis for optimizing the streaming media business system.

  A Hybrid Spray and Wait Routing Scheme in Delay Tolerent Based on Energy Considerations

  WANG Guizhu,LU Huating,XU Liang

  2010, 32(12): 8-11. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 491 )   PDF (539KB) ( 392 )   　　

  Delay Tolerant Networks is an emerging research field. In this kind of networks,the

  connections between nodes are frequently interrupted,and it is difficult to predict them. At

  present,a common strategy is to use multiplecopy routing for message delivery.

  However,considering the characteristic that the majority of nodes’ energy supplies are

  limited,a large number of additional copies transmission will make some nodes’ energy

  consumption larger,making the nodes stop working faster,eventually leading to the rapid

  decline of the routing performances. With different energy supplies on each node in the

  networks,a hybrid spray and wait routing algorithm,which is ameliorated by the spray and

  wait routing algorithm,is put forward in this paper . The simulation indicates that this

  routing algorithm has better performances on the delivery probability and the average delay

  by increasing the cost of energy consumption differently at every node.

  Research and Implementation of the Application Server Based on IPv6

  WANG Yonglin

  2010, 32(12): 12-14. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 424 )   PDF (608KB) ( 369 )   　　

  It is well known that IPv4 will eventually be replaced by IPv6. However,the current development of network applications based on IPv6 is still in the initial stage. The paper analyzes the support of FTP for IPv6,and proposes a solution for the FTP server based on IPv6 in Linux. The FTP server is tested in real networks and the working process is analyzed with the Sniffer software. The result shows that the proposed FTP server fully supports IPv6,and the basic functions such as login,authentication of passwords,sending of file lists,downloading,uploading and deleting of files are implemented.

  Design and Implementation of the Sniffer Prototype Based on the MAC Spoofing

  CHEN Xinnan1，Hu Huaping1，2，YUE Hong2

  2010, 32(12): 15-18. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 491 )   PDF (618KB) ( 349 )   　　

  In the switchbased LAN environment,the means of defending the ARP spoofing is maturing,leading to the sniffer based on the ARP spoofing is vulnerable to being intercepted and killed by security software,so it lacks sniffing effect. In this paper,one nonARP spoofing,which is called MAC spoofing,is proposed,and a LAN sniffer prototype based on the MAC spoofing is also designed and implemented. Compared with the  traditional ARP spoofing,the MAC spoofing can bypass a variety of ARP spoofing defense tools and succeed to intercept the network data,as well as carrying on the Denial of Service attacks. Through the use of a timealternate mechanism,a filtering mechanism and other key technologies,the efficiency and accuracy of the sniffer can be highly improved. The testing result shows that the sniffer may be better to break through the interception and killing of security software,and achieve the effect of sniffing.

  An Optimal Security Strategy Generation Method for Embedded RealTime Systems

  CAO Xiaofeng1,YANG Wenqiang2

  2010, 32(12): 19-21. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 467 )   PDF (531KB) ( 410 )   　　

  Due to system resources and realtime constraints，the security design methods for general computing systems are not fit for the realtime embedded systems,so,it is necessary to study the special design method. To obtain the optimal security of embedded systems under realtime constraints,a complete set of security design methods which include the securityrelated task graph model and the security evaluation model are proposed in this paper. Based on these,an ILP based optimal security strategy generation method named ILPOS is also proposed. This method can select security algorithms and detect the realtime schedulability simultaneously. That is more efficient than the phased coupled optimization methods,therefore,it can make full use of the system time for security extension. The experimental results show that ILPOS can improve the system security efficiently under various time constraints compared with the traditional heuristic algorithms.

  Research on the Intrusion Detection Based on Plan Recognition

  CAI Zengyu1,GU Wenxiang2,GAN Yong1,LIU Shuru1

  2010, 32(12): 22-26. doi: 10.3969/j.issn.1007130X.2010.1

  Abstract ( 453 )   PDF (436KB) ( 393 )   　　

  Plan recognition is one of the important branches of artificial intelligence,and it has been preliminarily applied in intrusion detection systems(IDSs). The fundamental conception of plan recognition and IDS are introduced firstly. And then it studies on the applications and progresses of plan recognition in IDS according to the classification of plan recognizing methods,such as plan recognition based on event,plan recognition based on the Bayesian network,plan recognition based on the extended goal graph,colored petri net,adversarial planning and action state diagram. Subsequently,the common characteristics of plan recognition and IDS are thorough analyzed. Finally,the development trends and the existing problems of this domain are discussed. This review deals with the key technology and the existing problems of plan recognition implicating in IDS，which is very helpful for the related personnel research in the logistics fields.

  The Realization of Evaluation for Network Intrusion Based on Cloud Theory

  WAN Biao

  2010, 32(12): 27-29. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 456 )   PDF (410KB) ( 469 )   　　

  Network intrusion has the features of randomness and uncertainty, cloud theory

  integrates the fuzziness and randomness perfectly. An evaluation model for network risk is

  proposed based on the cloud theory. The model monitors the system resources and processes

  the achieved data, then the data is input into the cloud controls, the evaluation result is

  achieved finally. The experimental results show that the methods can evaluate the network

  risk efficiently. It holds the uncertainty of evaluation process and improves the

  reliability of the result.

  On the PortalBased Uniform Identity Authentication and System Integration

  HU Jianpeng

  2010, 32(12): 30-33. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 539 )   PDF (572KB) ( 481 )   　　

  Portal technology has been widely applied in the digital campus construction,and

  unified authentication and application system integration is one of the core technologies.

  Single signon is a method to achieve a unified portal authentication. An approach is

  proposed which uses cookie tokens,access permissions and control procedures to achieve cross

  domain access,and uses the LDAP database to complete the user's login,authentication and

  rights management. According to different types of network applications in the campus,four

  kinds of integration methods to meet different needs are also introduced.

  An Efficient Search Strategy for Image Matching Based on Quantum Genetic Algorithms

  GAO Yinghui,WANG Ping,WANG Peng

  2010, 32(12): 34-38. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 546 )   PDF (537KB) ( 350 )   　　

  When the source image scale is large enough,the search time will be excessively

  long if the entire space searching on the source image is carried on. In order to decrease

  the search time and  increase the realtime matching capability,a target elimination search

  strategy (TESS) is proposed based on the source image division and the basic principle of

  QGA. Through changing the random searching process in the entire space to the parallel

  searching in each subspace and the subspaces gradually,TESS combines the matching region

  roughestimating with the optimal matching point finesearching effectively,so the search

  time  decreases enormously. The experimental results indicate that TESS makes the matching

  efficiency is improved enormously and  the time speedup increases with the  source image

  scale increase.

  Visual Emotion Analysis and Recognition Based on Manifold Features

  LI Qing1,JIANG Dongmei1,FAN Ping2,Ravyse Ilse2,Sahli Hichem2

  2010, 32(12): 39-41. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 419 )   PDF (677KB) ( 542 )   　　

  This paper studies the Isomapbased nonlinear dimensionality reduction and
  visualization method,applies it to the feature reduction of facial animation parameters of
  emotional facial image sequences,and analyzes the relationship between the reduced
  dimension space and the cognitive psychological emotion space.The experimental results show
  that the coordinate of the manifold feature in the reduceddimension space shows the
  emotion intensity of the corresponding image frame,and the intensity curve of an emotional
  facial sequence from Isomap is more reasonable and smooth than that from PCA. The visual
  emotion recognition results also show that the mainfold features from Isomap have better
  performance than the original features and the manifold features from PCA.Moreover,the
  recognition rates are more balanced between different emotions.

  A Fast  License Plate Location and Extraction Algorithm

  LI Yucheng,WANG Mushu

  2010, 32(12): 42-45. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 394 )   PDF (607KB) ( 892 )   　　

  For the limitation of the current license plate location algorithms,the paper
  presents an algorithm of license plate location based on the image 2D area energy and its
  practical formulas,and Introduces the algorithm of extraction and methods to verify the
  region of the license plate. It takes full advantage of the characteristics of the license
  plate,such as complicated textures,sharpcut contrast,and so on. It also has the advantages
  to avoid the difficulty to choose a threshold and the influence of color changes due to
  light.Many experiments demonstrate that the algorithm is of higher accuracy and of fast
  speed.

  A Method of AntiDisturbance  by Ragged Clouds for Detecting Ships on  the Sea

  CHEN Hailiang,LEI Lin,ZHOU Shilin

  2010, 32(12): 46-49. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 456 )   PDF (738KB) ( 472 )   　　

  Focusing on the problem of ship detection in poor imaging conditions,which means
  here,being disturbed by lots of ragged clouds in optical images,a robust ship detection
  algorithm is proposed based on the characteristics of the background and the target itself.
  Firstly,it extracts ROI using two parameters and local CFAR. Then it extracts the wake
  information by the improved local Radon transform and a peak value extraction algorithm in
  succession.The experiments of satellite images show that this method can reduce false alarms
  caused by ragged clouds effectively .

  Research of a  Fingerprint Matching Algorithm Based on Fuzzy Similarity

  ZHU Guiliang， SONG Ruifang,FAN Xuehui

  2010, 32(12): 50-52. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 439 )   PDF (507KB) ( 419 )   　　

  Because of the low accuracy and efficiency of the existing fingerprint matching
  algorithms,and the high complexity of them,fingerprint matching algorithm based on fuzzy
  closedegree is proposed here. It takes the turning point,bifurcation point,the number of
  ridge lines between two points in fingerprint images and so on as the feature of the
  object,computes the fuzzy closedegree,and compares the results and threshold V. Then we
  judge whether the fingerprint matches the template fingerprint. The results show that it
  improves the accuracy and efficiency of the fingerprint matching algorithm,and also lowers
  the complexity of the algorithm. It is slightly influenced by the factor of environment,such
  as the shift and rotation of the fingerprint. It provides a new method for improving the
  accuracy of fingerprint matching.

  Improvement of the Gray Image Maximum Entropy Segmentation Method

  ZHENG Liping1,LI Guangyao2,JIANG Hua1

  2010, 32(12): 53-56. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 483 )   PDF (635KB) ( 825 )   　　

  In the traditional maximum entropy threshold segmentation methods,the gray
  probability of image is used and the corresponding gray value is ignored. In order to
  adequately utilize the gray information and spatial information of the gray image,the
  traditional 2D gray histogram is improved and the 2D Dvalue attribute gray histogram is
  formed. Otherwise,the computation method for the average gray value and the 2D entropy is
  improved.We use the spatial information value as a substitute for the gray probability to
  compute the entropy.The computation of the entropy is based on the Dvalue attribute gray
  histogram and creates the spatial different attribute information value entropy(SDAIVE). In
  experiments,many different gray images are segmented with the improved maximum entropy
  method and the traditional maximum entropy method,and the segmentation results are
  compared.The experimental results show that improved threshold method can effectively
  segment gray images and noise images. This method has strong antinoise capability and
  clear segmentation results.

  A Method for Extracting the  Handwritten Chinese Strokes  Based on Shape Decomposition

  YUAN Yuan,LIU Wencai

  2010, 32(12): 57-60. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 380 )   PDF (587KB) ( 494 )   　　

  Stroke extraction is the preprocessing step of the writer identification which is
  aimed at distinguishing between different writers. This paper presents an algorithm for the
  handwritten character stroke extraction of writer identification. The corresponding
  relationship between the discontinuous points of contours and junction regions of strokes is
  defined. All junction regions and the junction types are determined by the detection of the
  convex and concave discontinuous points in the contours of character images,and the junction
  regions are decomposed as their junction types. Strokes are thinned by the method of the
  following contour,finally.The experimental results show that the proposed method is
  effective and accurate compared to the methods based on thinning and segmenting techniques.
  Therefore,the method for extracting the handwritten chinese strokes based on shape
  decomposition in this paper features high operational ability and is practical.

  Analysis and Extraction of  a Characteristic Radius of the Trajectory Charging in a Blast Furnace Charging Process

  LI Ying1,LIU Wanjun1,QU Haicheng2

  2010, 32(12): 61-64. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 329 )   PDF (1185KB) ( 271 )   　　

  As for the difficulty in analysing the trajectory charging of the current blast
  furnace,the pattern recognition technique is introduced and the mesurement method of the
  polar coordinate laser grid is proposed. To contrast the edge analysis of trajectory
  charging,we calculate the threshold value by linear probing. According to the image quality
  of trajectory charging in the difference spectrum,the characteristic radius is analysed and
  defined at the same time to different lengths of the characteristic radius for attaining
  accurate trajectory charging data information,the trajectory charging in polar coordinate is
  reconstructed,and the automatic control information of the blast furnace is obtanied.

  A Simplification Method for Cloud Points Based on Local Surface Fitting

  ZHANG Lianwei,LI Yan,LIU Xiaolin,SHI Meiping,HE Hangen

  2010, 32(12): 65-68. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 470 )   PDF (826KB) ( 519 )   　　

  With the improvement of the technology of data acquirement,the cloudpoint data
  is used more and more widely in 3D reconstruction. The huge data size becomes the
  bottleneck of reconstruction efficiency. The feature of models is blurred because of the
  calculation accuracy of the curvature used in the existing simplification methods. A
  quantitative definition of the surface feature is proposed based on qualitative analysis.
  The approximate surface near a sampled point is obtained by the local surface fitting
  method. Then the feature of the surface near the sampled point is described by the average
  of the normal curvature in 360 degree instead of the average curvature. A KD tree
  partitioning method is adopted to segment the cloud points according to the surface
  feature,the size of space area and the size of sampling nodes. Experiments show that this
  method preserves the geometry feature of the surface better. This result demonstrates the
  efficiency of the method.

  The Research Based on the Simplification of the Triangular Mesh Model

  YAN tao1，JIANG Xiaofeng2,WANG Yu1

  2010, 32(12): 69-72. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 382 )   PDF (947KB) ( 610 )   　　

  The triangular mesh model requires a lot of information to record points, the connection between the edge and face relations,and the complex  models  require a lot of storage space,and  the network transmission speed is slower. Triangular mesh model simplification is significant  for its storage,processing,transmission and realtime rendering. In this paper,on the basis of the relevant technical studies,a simplified algorithm based on triangle removal is designed. The algorithm first calculates the weight of the triangle,according to the weight difference  to remove the corresponding triangular mesh model  region,and then rebuilds the deleted  region by triangular mesh reconstruction. Finally,two examples discussed in the original mesh model and the simplified mesh model comparison show that the design of this mesh simplification algorithm  effectively implements the triangular mesh model simplification,maintains  the basic features of the original  triangular mesh model,increases  the simplification  efficiency,and achieves a satisfactory result.

  Application of Histogram Invariant Moments in Zero Digital Watermarking

  HE Bing,WANG Juxia

  2010, 32(12): 73-75. doi: 10.3969/j.issn.1007130X.2010.

  Abstract ( 512 )   PDF (560KB) ( 364 )   　　

  This paper proposes a zero digital watermarking image algorithm using histogram invariant moments to resist geometric attacks .The construction of the watermark system for the original image is achieved by analyzing the histogram and computing the histogram invariant moments.Watermark extraction is simple,and only a few histogram invariant moments need to be calculated.The experimental results are compared with the results of the method based on the geometric moments.The simulation experiments demonstrate the proposed method is robust to rotation,scaling geometric attacks as well as to filtering,JPEG compression .so the proposed method is a simple,useful and credible algorithm.